Arc-lamp.



VBM

S. P. WILBUR.

ARC LAMP.

APPLICATION FILED APILZB, 1906.

931,168. Patented Aug. 17, 1909.

T Y J INZENTOR.

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W1 TNESSES "hurrah SAMUEL P. WILBUR, OF WILKINSBURG, PENNSYLVANIA,ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A.CORPORATION OF PENNSYLVANIA.

ARC-LAMP.

To all whom it may concern:

Be it known that I, SAMUEL P. VVILBUR, a citizen of the United States,and a resident of VVilkinsburg in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Arc-Lamps,of which the following is a specification.

My invention relates to arc lamps and it has for its object to provide acut-out and feed regulating device therefor which shall enable operationof the lamp upon either a direct or an alternating current circuit, andwhich shall insure feeding of the electrodes upon the occurrence of aconstant predetermined voltage at the arc, regardless of the variationsin the amount of current that traverses the circuits of the lamp.

The single figure of the accompanying drawing is a diagrammatic view ofthe structure and circuits of an arc lamp that embodies my invention.

A pair of electrodes 1 and 2, that are normally in engagement, areadapted to be separated by means of a magnet having a winding 3connected in series with the electrodes between binding posts 4 and 5 ofthe lamp. Connected directly between the binding posts 4 and 5 is acomparatively high resistance magnet winding 6 that is mounted upon aprojection 7 from a laminated magnetizable core 8, the remainder ofwhich is of substan tially E-shape. A. movable armature 9 for themagnetizable core 8 carries a terminal piece 10 that is adapted to bebrought into engagement with a stationary terminal piece 11 when thearmature 9 is attracted by the core 8, for the purpose of establishing acircuit through a resistance 12 and a magnet winding 13 placed upon themiddle of the E-shaped portion 01": the magnet core 8. The highresistance magnet winding 6 becomes sutliciently energized to cause thecore 8 to attract the armature 9 when the voltage between the electrodesrises to a predetermined value, and the magnet winding 13 serves toretain the switch in closed position until the electrodes 1 and 2 areagain brought into engagement.

When current is first supplied to the lamp, the magnet winding 3 becomesenergized and causes separation of the electrodes 1 Specification ofLetters Patent.

Application filed. April 28, 1906.

Patented Aug. 17, 1909.

Serial No. 314,206.

and 2, an are being thereby established be tween them. When the voltagebetween the electrodes exceeds a predetermined limit the magnet winding6 becomes sufficiently energized to cause the armature 9 to be raised toetlect engagement of the contact terminals 10 and 11. The contactterminals 10 and 11 will be maintained in engagement by the magnetwinding 13 until the electrode 1 drops into engagement with electrode 2,whereupon a comparatively low resistance circuit will be establishedthrough the magnet winding 3 and the electrodes 1 and 2, when thearmature 9 will be released, on account of the reduced magnetizingeffects of the Windings 6 and 13. Separation of electrodes will then beeilected in the usual manner by the magnet winding 3. If, for anyreason, the electrodes are not brought into engagement, the magnetwinding 13 will remain energized and the lamp will be removed fromservice without interrupting the circuit from which it is supplied. Themagnetizable core 3 is laminated and shaped in the manner shown, inorder that, when the lamp is supplied with alternating current, heatingof the core will not take place and no transformer action will occurbetween the windings 13 and 6 while the switch contacts 10 and 11 are inengagement because little or none of the flux produced by each of thewindings 6 and 13 surrounds the other. Obviously, the lamp may also besupplied from a direct current circuit. The voltage at which the magnetwinding 6 becomes sutficiently energized to cause feeding of the upperelectrode may be regulated within considerable limits by adjusting theweight of the armature 9, by means of suitable counter-weights 14k, orotherwise so' that changing of the windings for this purpose will beunnecessary in many cases.

I claim as my invention:

1. In an arc lamp, a cut-off device comprising a magnetizable core ofsubstantially E-shape but provided with an auxiliary projecting portionon the side opposite to the three main projections, a magnet windingconnected in shunt to the arc and mounted upon the auxiliary projectingportion of the core, a magnet winding mounted upon the central inainprojection of the core, and a arated, and a inagnetizable core uponwhich 10 switch for controlling the circuit thereof t the said magnetwindings are mounted in that is actuated by an armature for the core. rnon-inductive relation to each other.

2. In an arc lamp, a cut-out switch for In testimony whereofllhavehereunto subestablishing a circuit in shunt to the are, an i scribed myname this 21st day of April, 1900. operating magnet winding thereforpermal Si-MWHTEL P. WWJBUR. nently connected in shunt to the arc, a mag-I Witnesses: net winding for maintaining the switch in BURT Bar, closedposition when the electrodes are sep- BIRNEY HINEs.

